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Array.from()

The Array.from() method creates a new Array instance from an array-like or iterable object.
Array ECMAScript6 JavaScript Method polyfill

Array.isArray()

The Array.isArray() determines whether the passed value is an Array
Array ECMAScript5 JavaScript Method polyfill

Array.of()

The Array.of() method creates a new Array instance with a variable number of arguments, regardless of number or type of the arguments.
Array ECMAScript6 JavaScript Method polyfill

Date.now()

The Date.now() method returns the number of milliseconds elapsed since 1 January 1970 00:00:00 UTC.
Date JavaScript Method polyfill Reference

object-fit

The object-fit CSS property specifies how the contents of a replaced element should be fitted to the box established by its used height and width.
CSS CSS Image CSS Property polyfill Reference

Array.prototype.copyWithin()

The copyWithin() method shallow copies part of an array to another location in the same array and returns it, without modifying its size.
Array ECMAScript6 JavaScript Method polyfill Prototype

Array.prototype.every()

The every() method tests whether all elements in the array pass the test implemented by the provided function.
Array ECMAScript5 JavaScript Method polyfill Prototype

Array.prototype.fill()

The fill() method fills all the elements of an array from a start index to an end index with a static value.
Array ECMAScript6 JavaScript Method polyfill Prototype

Array.prototype.filter()

The filter() method creates a new array with all elements that pass the test implemented by the provided function.
Array ECMAScript5 JavaScript Method polyfill Prototype Reference

Array.prototype.find()

The find() method returns a value in the array, if an element in the array satisfies the provided testing function. Otherwise undefined is returned.
Array ECMAScript 2015 ECMAScript6 JavaScript Method polyfill Prototype

Array.prototype.findIndex()

The findIndex() method returns an index in the array, if an element in the array satisfies the provided testing function. Otherwise -1 is returned.
Array ECMAScript6 JavaScript Method polyfill Prototype

Array.prototype.includes()

The includes() method determines whether an array includes a certain element, returning true or false as appropriate. 
Array JavaScript Method polyfill Prototype Reference

Array.prototype.indexOf()

The indexOf() method returns the first index at which a given element can be found in the array, or -1 if it is not present.
Array JavaScript Method polyfill Prototype Reference

Array.prototype.lastIndexOf()

The lastIndexOf() method returns the last index at which a given element can be found in the array, or -1 if it is not present. The array is searched backwards, starting at fromIndex.
Array ECMAScript5 JavaScript Method polyfill Prototype

Array.prototype.map()

The map() method creates a new array with the results of calling a provided function on every element in this array.
Array ECMAScript5 JavaScript Method polyfill Prototype

Array.prototype.reduceRight()

The reduceRight() method applies a function against an accumulator and each value of the array (from right-to-left) has to reduce it to a single value.
Array ECMAScript5 JavaScript Method polyfill Prototype

Date.prototype.toISOString()

The toISOString() method returns a string in simplified extended ISO format (ISO 8601), which is always 24 or 27 characters long (YYYY-MM-DDTHH:mm:ss.sssZ or ±YYYYYY-MM-DDTHH:mm:ss.sssZ, respectively). The timezone is always zero UTC offset, as denoted by the suffix "Z".
Date JavaScript Method polyfill Prototype Reference

Function.prototype.bind()

The bind() method creates a new function that, when called, has its this keyword set to the provided value, with a given sequence of arguments preceding any provided when the new function is called.
ECMAScript5 ECMAScript6 Function JavaScript Method polyfill

JSON

The JSON object contains methods for parsing JavaScript Object Notation (JSON) and converting values to JSON. It can't be called or constructed, and aside from its two method properties it has no interesting functionality of its own.
JavaScript JSON Object polyfill Reference Référence

Object.assign()

The Object.assign() method is used to copy the values of all enumerable own properties from one or more source objects to a target object. It will return the target object.
ECMAScript6 JavaScript Method Object polyfill Reference